A CB is a short form for Cock Block, and it is when a guy and his girlfriend try to do stuff but one of their friends is always there to block the cock. the CB doesnt need to be there the person can text message the person, or phone the person.

Man andrea is suck a CB.
Did you get any last night or was your CB there?
It was just us the two but she still was a CB by texting her.

Citizens Band radio; state of the art in communications circa 1960, and all the rage in 1976 after the release of technological advances and the song Convoy. Popularity inspired further advances and lower prices, increasing popularity further.

An abbreviation for a forum called "Chatterbox" on the popular virtual anime based community called Gaia online. In the CB you can post anything from a legit discussion to "OMFG LYK GIMME YO DONATZZZ".

Person 1:"LOL GIMME SOME MUNNIES"
Person 2:"GTFO GD and go back to the CB noob.